package cn.shadow.test;

import java.util.concurrent.ConcurrentHashMap;

public class LandAnimal  {

    public static void main(String[] args) {
        ConcurrentHashMap<Integer, String> map = new ConcurrentHashMap<>();
        map.put(1, "100");
        String s = map.get(1);
        System.out.println(s);
    }
}
